I am trying to add a custom permission level to a SharePoint Online Site. The desired results would allow the visitor to add, edit, delete documents and folders but NOT be able to change any of the site design features.
It appears from this link: https://docs.microsoft.com/en-us/sharepoint/understanding-permission-levels that all permission levels that allow editing documents in a document library or site also give them design permission.
Am I missing something here? We want to give a large group of people access to a site but we don't want them changing how the site looks.